BUZZ-Merlin Entertainment: sharpest ever one-day drop on outlook cut
** Merlin Entertainment down 7.8 pct, stock's worst one-day fall ever, after co warns on annual profits
** Stock easily the biggest loser on the FTSE 100 with a glut of sell orders delaying opening prices
** Losses coming on heavy trading as volume in stock hits half a full-day's average in the first 10 minutes of trading
** Temporary closure of its Alton Towers theme park following a roller coaster crash in June would hit annual profits by 37-47 million pounds, co says
(RM (LSE: RM.L - news) : vikram.subhedar.thomsonreuters.com@reuters.net)